답안 #660525

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
660525 2022-11-22T07:27:02 Z mychecksedad Uplifting Excursion (BOI22_vault) C++17
0 / 100
2 ms 340 KB
/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, F = 2147483646, K = 20;

ll m, l, a[N], sum, ans, b[N][2], dp[N]; // + and - parts
void solve(){
    cin >> m >> l;
    for(int i = 0; i < 2*m+1; ++i) cin >> a[i];
    sum = ans = 0;
    for(int i = 0; i < 2*m+1; ++i) sum += a[i] * (i - m), ans += a[i], b[i][0] = 0, b[i][1] = a[i];
    if(sum == l){
        cout << ans;
        return;
    }
    ll c;
    if(sum > l){
        c = 2*m;
        while(sum > l && c > m){
            if(c==m){
                c--;
                continue;
            }
            if(sum - a[c] * (c - m) >= l) sum -= a[c] * (c - m), ans -= a[c], b[c][0] = a[c], b[c][1] = 0;
            else{
                ll num = (sum - l + (c - m) - 1) / (c - m);
                ans -= num;
                sum -= num * (c - m);

                b[c][0] = num;
                b[c][1] = a[c] - num;

                break;
            }
            c--;
        }
    }else{
        c = 0;
        while(sum < l && c < m){
            if(c==m){
                c++;
                continue;
            }
            if(sum - a[c] * (c - m) <= l) sum -= a[c] * (c - m), ans -= a[c], b[c][0] = a[c], b[c][1] = 0;
            else{
                ll num = (sum - l) / (c - m);
                ans -= num;
                sum -= num * (c - m);

                b[c][0] = num;
                b[c][1] = a[c] - num;

                break;
            }
            c++;
        }
    }
    ll M = 14*m;
    if(abs(l - sum) > M){
        cout << "impossible";
        return;
    }
    int v = l - sum + M;
    for(int i = 0; i <= 2*M; ++i) dp[i] = MOD;  
    dp[M] = 0;
    deque<pair<int, int>> p;
    for(int i = 0; i <= 2*m; ++i){
        if(i==m) continue;
        for(int j = 1; j <= min(b[i][0], m); ++j) p.pb({i - m, -1});
        for(int j = 1; j <= min(b[i][1], m); ++j) p.pb({m - i, 1});
    }
    sort(all(p));
    while(!p.empty()){
        for(int rep = 0; rep < 2 && !p.empty(); ++rep){
            pair<int, int> x;
            if(rep == 0) x = p.front(), p.pop_front();
            else x = p.back(), p.pop_back();
            if(x.first > 0){
                for(int j = 2*M - x.first; j >= 0; --j){
                    int val = j + x.first;
                    dp[val] = min(dp[val], dp[j] + x.second);
                }
            }else{
                for(int j = -x.first; j <= 2*M; ++j){
                    int val = j + x.first;
                    dp[val] = min(dp[val], dp[j] + x.second);
                }
            }
        }
        
    }
    if(dp[v] > 1e7) cout << "impossible";
    else cout << ans - dp[v];
}




int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    freopen("in.txt", "r", stdin);
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    return 0;
 
}

Compilation message

vault.cpp: In function 'int main()':
vault.cpp:112:16: warning: unused variable 'aa' [-Wunused-variable]
  112 |     int T = 1, aa;
      |                ^~
vault.cpp:113:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  113 |     freopen("in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -